English Evidence for Visa (Afrikaans SA) (Wellington)

Are there any Afrikaans speaking South Africans now living in New Zealand that can tell me if the IELTS tests are really necessary? We are planning to immigrate to New Zealand and I am not sure if we need this. I have submitted my EOI and just want to be ready if selected. I am working in the ICT industry so my degree and work is conducted in English, but not sure how to provide evidence of this. I guess I am just looking for some guidance on what others did in this instance. Thanks